<!DOCTYPE HTML>
<html>
<head>
<script>
	window.onload = function(){
		var canvas = document.getElementById("myCanvas");
		var context = canvas.getContext("2d");
		context.lineWidth = 15;
		context.strokeStyle = "black";
		
		context.arc(canvas.width / 2, canvas.height / 2 + 40, 80, 
			1.1 * Math.PI, 1.9 * Math.PI, false);
		context.stroke();
	}
</script>
</head>
<body>
	<canvas id="myCanvas" width="600" height="240" style="border:1px solid black;">
	</canvas>
</body>
</html>